You are allowed to say Fuck on the Internet. Why are you following the self-censorship rules for Instagram and other social networks if you are making a joke about them?
I realised that those who censor themselves on the Internet, grew up on the Internet when YouTube started demonitising profanities and thus picked up the habit.
I sorta remember it being bought but I can't say I actually recall what it was like pre-google. We had dialup at the time, and just the one family computer, so I didn't really watch a lot of videos